CN114264406B - Self-calibration couple type torque standard machine, self-calibration method thereof and torque testing method - Google Patents
Self-calibration couple type torque standard machine, self-calibration method thereof and torque testing method Download PDFInfo
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Abstract
The application relates to a self-calibration couple type torque standard machine, a self-calibration method and a torque testing method thereof, wherein the torque standard machine comprises a machine body, a lever and a torque input device, the lever is rotationally connected with the machine body, the lever is connected with a first connecting piece for coaxially connecting the lever with a tested product, and the torque input device is connected with a second connecting piece for connecting the tested product with the torque input device; the two ends of the lever are detachably connected with force application pieces with settable weight, and the two force application pieces are symmetrically distributed along the rotation axis of the lever; the machine body is provided with two force measuring pieces, the horizontal height of each force measuring piece is adjustable, when the machine is in operation, the sensing surface of one force measuring piece is in butt joint with the lever rotated to the horizontal position, and the force measuring pieces are used for detecting the force value of the acting force of the lever on the force measuring pieces; the combined torque direction of the force measuring piece and the force application piece to the lever is opposite to the torque direction input by the torque input device. The torque measuring device has the effects of improving the measuring range of torque measurement and improving precision.
Description
Technical Field
The application relates to the field of torque standard machines, in particular to a self-calibration couple type torque standard machine, a self-calibration method thereof and a torque testing method.
Background
At present, a torque standard machine is a physical performance testing instrument used in the fields of mechanics, engineering and technical science basic subjects, mechanical engineering, product application related engineering and technology, and is used for calibrating a torque sensor or a standard torque spanner with the torque sensor and other products.
The torque standard machine generally comprises a machine body, a lever, a bearing, a torque input device and weights, wherein a measured product is connected with the torque input device, the measured product is coaxially connected with the lever, the bearing is connected with the lever to realize free rotation of the lever relative to the machine body, and the torque input device can adopt a speed reducing motor and the like. The gear motor drives the tested product to output torque, the weight is hung at the end part of the lever, and when the lever rotates to a horizontal position, a worker can calculate the torque according to the total gram number of the weight and the length of the arm of force, so that the product can be calibrated conveniently.
For the related art, the weight has the characteristic of high precision, but is limited by the number of weights, and the number of stages of measurement is limited, so that the measurement range is limited.
Disclosure of Invention
In a first aspect, to increase the torque measurement range and reduce the workload during measurement, the present application provides a self-calibrating couple type torque standard machine.
The self-calibration couple type torque standard machine provided by the application adopts the following technical scheme:
the self-calibration couple type torque standard machine comprises a machine body, a lever and a torque input device, wherein the lever is rotationally connected with the machine body, the lever is connected with a first connecting piece for coaxially connecting the lever with a tested product, and the torque input device is connected with a second connecting piece for connecting the tested product with the torque input device;
the two ends of the lever are detachably connected with force application parts with settable weight, and the two force application parts are symmetrically distributed along the rotation axis of the lever;
when in operation, only one force application piece acts on the lever;
the machine body is provided with two force measuring pieces, the horizontal height of each force measuring piece is adjustable, and each force measuring piece is used for detecting the force value of acting force of the lever on each force measuring piece;
when in operation, the sensing surface of one force measuring piece is in butt joint with the lever which rotates to the horizontal position;
the combined torque direction of the force measuring piece and the force application piece to the lever is opposite to the torque direction input by the torque input device.
By adopting the technical scheme, when the torque input by the torque input device is clockwise in working, the gravity of the force application part on one side is used for forming a pair of couples with the acting force of the lever and the reaction force of the force measurement part on the other end of the lever on the lever, and the couples are balanced with the torque input by the torque input device. When the torque input by the torque input device is anticlockwise, the acting force of the gravity of the other side force application part on the lever and the reaction force of the force measurement part at the other end of the lever on the lever form a pair of couples, and the couples are balanced with the torque input by the torque input device; if the pulling force of the force application part is smaller than the current torsion of the tested product, the force measurement part can continuously provide supporting force to make the lever level, so that the torque sensor can be conveniently calibrated; the force application part can provide stepped tension, and the force measurement part provides high-precision force values, so that the torque measurement range is increased, and the workload during measurement is reduced; the force application part can provide stepped pulling force, and the force measurement part provides high-precision force value, so that the torque measurement range is increased, and the workload during measurement is reduced.
Preferably, the force measuring member comprises a force sensor and a position adjusting mechanism for adjusting the horizontal height of the force measuring member, and the force applying member comprises a set of weight sets capable of generating different force levels.
By adopting the technical scheme, the force sensor, such as a piezoelectric force sensor, a capacitive force sensor and an inductive force sensor, has the problems that the force sensor is accurate in measuring smaller force and the error is increased when measuring larger force, and meanwhile, the measurable range of the force sensor is generally smaller, so that the range of the torque standard machine is increased by adopting a mode of combining the force sensor and weights, and the weights are high in single precision but not easy to refine and combine, so that the force sensor is used for providing larger pulling force and providing larger base number, and the force sensor is responsible for measuring the redundant part and measuring smaller force so as to ensure the measuring precision of the force sensor and mutually match, thereby not only reducing the workload of weight refinement combination, but also improving the integral precision; the position adjusting mechanism can switch the used force measuring piece, so that the anticlockwise test or clockwise test of the tested product is facilitated.
Preferably, the rotation center of the lever is located in the middle of the lever, the two force measuring pieces are symmetrically distributed at two ends of the lever, the two force applying pieces are symmetrically distributed at two ends of the lever, and the sensing surface of each force measuring piece faces upwards and is located below the end part of the lever.
Through adopting above-mentioned technical scheme, the rotation center of lever is located its middle part to offset the influence of lever self weight to its balance, dynamometer spare and application of force spare are located the both ends of lever respectively, conveniently measure and calculate the moment of torsion.
Preferably, the force measuring piece and the force application piece are positioned at the same end of the lever and above and below the lever respectively, and the sensing surface of the force measuring piece faces downwards and is opposite to the end of the lever.
By adopting the technical scheme, the force measuring piece and the force application piece are positioned at the same end of the lever, and one end of the lever is positioned between the force measuring piece and the force application piece, so that the supporting force of the force measuring piece is identical with the tensile force of the force application piece in the torsion direction, and the torque is convenient to measure and calculate.
Preferably, the sensing surface of the force measuring piece is in line contact with the lever, so that the change of the force arm during working is reduced.
Through adopting above-mentioned technical scheme, through the line contact, can reduce the span region of atress to this makes the arm of force change of dynamometry spare reduce, conveniently obtains accurate arm of force length, thereby conveniently calculates the moment of torsion.
Preferably, the rotation center of the lever is located in the middle of the lever, and mounting pieces are arranged at two ends of the lever and are used for being connected with the force application piece.
By adopting the technical scheme, the mounting pieces are arranged at the two ends of the lever, so that the force application pieces can be mounted at the two ends of the lever, and the reverse bearable torque value of the tested product can be measured by changing the mounting positions of the force application pieces or by preparing two groups of symmetrical force application pieces in advance under the condition of not re-mounting the tested product.
Preferably, a rotary supporting structure is connected between the lever and the machine body, and the rotary supporting structure comprises one of a knife bearing structure and a low-resistance bearing.
By adopting the technical scheme, the cutter bearing structure has small contact surface of the fulcrum, so that the influence of external force on the lever is reduced, and the low-resistance bearing can improve the torque calculation precision in a manner of reducing the self friction force.
In a second aspect, in order to improve the accuracy of torque measurement and reduce the workload, the present application provides a self-calibration method, which adopts the following technical scheme:
a self-calibration method, which is applied to the self-calibration couple type torque standard machine, comprises the following steps:
a weight set at one end of the lever is started, and the weight set comprises a plurality of weights with equal mass;
the sensing surface of the force measuring piece positioned on the same side with the activated weight set is abutted with the lever in the horizontal position through the position adjusting mechanism, and the other force measuring piece is separated from the lever;
clearing a force measuring piece signal;
the weights of the enabled weight stack are loaded step by step, and the torque of the force measuring unit is calibrated through the multistage torque generated by the weight stack.
Through adopting above-mentioned technical scheme, gravity G based on the weight has very high degree of accuracy, and loading lever arm of force L keeps invariable, according to torque formula (T=GL), can regularly carry out the self calibration to the moment of torsion that the dynamometer produced through the moment of torsion that the weight produced, through the dynamometer of weight code group calibration same one side promptly to make the dynamometer can guarantee high accuracy, thereby promote the holistic precision of moment of torsion standard machine.
In a third aspect, in order to improve the accuracy of torque measurement and reduce workload, the present application provides a torque testing method, which adopts the following technical scheme:
a torque testing method, which is applied to the self-calibration couple type torque standard machine, comprises the following steps:
preparation: installing a tested product, a lever and a torque input device;
leveling: the sensing surface of one force measuring piece is abutted with a lever at the horizontal position, the other force measuring piece is separated from the lever, and a force measuring piece signal is cleared;
and (3) testing: starting a weight set which is positioned at the different ends of the lever from a force measuring piece abutting against the lever, and gradually loading weights of the weight set to enable the torque T1 generated by the loaded weights to be close to 1/2 of the target value T of the torque value of the product to be measured; synchronously starting a torque input device, increasing the torque output of a tested product until the torque value T2 of the force measuring piece reaches (T-T1), and finishing the detection of a torque measuring point of the tested product;
and (3) adjusting the torque value target value T of the measured product, and repeating the steps to finish the detection of a plurality of torque measuring points of the measured product.
By adopting the technical scheme, the torque output of the detected product is increased, so that the detected product reaches a certain measuring point, namely the target value T of the torque value of the detected product, and the weight of the weight set is increased until the integral torque of the force measuring piece and the weight set is close to the torque of the detected product, thereby completing the detection of one torque measuring point of the detected product, and the calibration is performed for multiple times by adjusting the target value T of the torque value of the detected product, so that the calibration precision is improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. when the torque input by the torque input device is clockwise, the gravity of the force application part on one side applies the acting force of the lever and the reaction force of the force measurement part on the other end of the lever to the lever form a pair of couples, and the couples and the torque input by the torque input device are balanced. When the torque input by the torque input device is anticlockwise, the acting force of the gravity of the other side force application part on the lever and the reaction force of the force measurement part at the other end of the lever on the lever form a pair of couples, and the couples are balanced with the torque input by the torque input device; the force application part can provide stepped tension, and the force measurement part provides high-precision force values, so that the torque measurement range is increased, and the workload during measurement is reduced;
2. the measuring range of the torque standard machine is increased by adopting a mode of combining the force sensor and the weight, and the weight is high in single precision but not easy to refine and combine, so that the torque standard machine is used for providing larger pulling force and larger base number, the force sensor is responsible for measuring and complementing redundant parts and measuring smaller force so as to ensure the measuring precision of the force sensor;
3. the span area of stress can be reduced through the line contact between the sensing surface of the force measuring piece and the lever, so that the moment arm change of the force measuring piece is reduced, the accurate moment arm length is conveniently obtained, and the torque is conveniently calculated;
4. because the force measuring piece and the force application piece apply force to the lever in a force couple mode, the friction torque of the rotating support structure can be greatly reduced, and the measurement accuracy is improved.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a self-calibrating couple type torque standard machine of example 1 of the present application.
Fig. 2 is a schematic side view of a self-aligning couple type torque standard machine of embodiment 1 of the present application, mainly showing a force measuring member and a force applying member.
Fig. 3 is a schematic view of a part of the self-calibrating couple type torque standard machine of embodiment 2 of the present application, mainly showing a low-resistance bearing.
Reference numerals illustrate: 1. a body; 11. a lever; 12. a force application member; 13. a force measuring member; 14. a mounting member; 15. a torque sensor; 16. a speed reducing motor; 2. a low resistance bearing; 21. a bearing sleeve; 22. a first through hole; 23. a second through hole; 24. a hollow cavity; 25. a pressure-bearing inner ring; 26. a rotating shaft; 3. a support assembly; 31. a supply source; 32. a transmission member; 4. a position adjusting mechanism; 41. a slide seat.
Detailed Description
The present application is described in further detail below with reference to the accompanying drawings.
The product to be tested in this embodiment employs a torque sensor 15, such as a KR-803 model dynamic torque sensor 15 having an input shaft and an output shaft, and the torque sensor 15 reads the torque of the input shaft relative to the output shaft.
Example 1:
referring to fig. 1 and 2, the self-calibration couple type torque standard machine comprises a machine body 1, a lever 11, a low-resistance bearing 2 and a torque input device, wherein the lever 11 is rotationally connected with the machine body 1 through the low-resistance bearing 2, the lever 11 is coaxially fixed with one end of a torque sensor 15 through a first connecting piece, and the torque input device is connected with the other end of the torque sensor 15 through a second connecting piece. The two ends of the lever 11 are connected with a force application member 12 and a force measurement member 13, the weight of the force application member 12 can be set, the end of the lever 11 is abutted against the sensing surface of the force measurement member 13, the force measurement member 13 displays a force value at the moment, and the torque of the torque sensor 15 can be calibrated through the force value acquired by the force measurement member 13 and the weight of the force application member 12.
The rotation center of the lever 11 is located in the middle of the lever 11, a fixed shaft is coaxially fixed in the middle of the lever 11, and the torque input device can adopt a gear motor 16, and the gear motor 16 is fixed with the machine body 1 through bolts. The first connecting piece and the second connecting piece all adopt the shaft coupling, and the output shaft of gear motor 16 passes through the shaft coupling and is fixed with the input shaft coaxial of torque sensor 15, and the output shaft of torque sensor 15 passes through the shaft coupling and is fixed with the fixed axle coaxial to this dismouting of making things convenient for torque sensor 15. The lever 11 is provided with a level gauge, the level gauge is fixed with the lever 11 through bolts, the level gauge adopts a model with an indexing value not more than 0.05/1000, for example, the model RSL-AA2002, and can be used for measuring whether the lever 11 is inclined or not and is kept at a horizontal position, and torque can be measured and calculated at the horizontal position, so that errors caused by the change of a moment arm are reduced.
Referring to fig. 1 and 2, the force measuring member 13 is located between the center of the lever 11 and the force applying member 12, both the force measuring member 13 and the force applying member 12 are located below the lever 11, the combined torque direction of the left force measuring member 13 and the right force applying member 12 to the lever 11 is opposite to the torque direction input by the torque input device, and similarly, the combined torque direction of the right force measuring member 13 and the left force applying member 12 to the lever 11 is opposite to the torque direction input by the torque input device. When the torque standard machine works, only one group of force measuring pieces 13 and force applying pieces 12 with opposite torque directions are put into use.
The force application member 12 in this embodiment adopts weight sets capable of generating different force levels, the number of weights is at least one, and when the measurement accuracy level is 0.03, the maximum allowable error of the weight mass is ±0.003%. The weight can be carried by a weight calibration machine, the two ends of the lever 11 are respectively provided with a mounting piece 14, each mounting piece 14 comprises a hanging ring connected with the lever 11 by a cutter bearing, a hanging hook of the weight at the top of the weight set is connected with the hanging ring, the adjacent weights are connected by the hanging hooks, when the automatic lifting platform of the weight calibration machine bears the weight below, the pulling force born by one end of the lever 11 is correspondingly reduced, and the reduced pulling force is the gravity of the weight borne by the automatic lifting platform. Because both ends of the lever 11 are provided with hanging rings, the mounting positions of weights can be changed, and when the weight set is started, only the weights are needed to be mounted on the hanging rings, so that the reverse torque value of the tested product can be measured under the condition that the tested product is not reinstalled, and the applicability of the torque standard machine is improved.
The force measuring device 13 adopts a force sensor, and the force sensor can adopt a piezoelectric pressure sensor and a capacitive pressure sensor, and the specific selection depends on the measuring range and the precision. The distance between the measuring points of the two groups of force sensors and the rotation axis of the lever 11 is equal, and the connecting line of the force applying points of the weight groups and the measuring points of the force sensors is perpendicular to the rotation axis of the lever 11.
The sensing surface of each force measuring piece 13 faces upwards, a position adjusting mechanism 4 is arranged on the machine body 1, each force measuring piece 13 corresponds to a group of position adjusting mechanisms 4, the position adjusting mechanisms 4 are used for measuring the horizontal height of each force measuring piece 13, the position adjusting mechanisms 4 are hydraulic cylinders, air cylinders or electric cylinders and the like, in the embodiment, the cylinder bodies of the hydraulic cylinders are fixed with the machine body 1 through bolts, sliding bases 41 are fixed on piston rods of the hydraulic cylinders, and one side of each sliding base 41 is in sliding fit with a dovetail groove formed in the side wall of the machine body 1, so that vertical sliding of the sliding bases 41 is achieved. The force sensor is fixed on the top surface of the sliding seat 41, and the height of the sliding seat 41 can be adjusted through a hydraulic cylinder, so that the height of the force sensor can be adjusted, and the force sensor can be selectively activated.
As illustrated in fig. 2, if it is desired to calibrate the torque of the torque sensor 15 in the clockwise direction of fig. 2, the left weight stack is activated and the right force sensor is controlled to rise to a height in abutment with the lever 11 in the horizontal position, simultaneously lowering the left force sensor. If it is desired to calibrate the torque of the torque sensor 15 in the anticlockwise direction in fig. 2, the right weight set is activated and the left force sensor is controlled to rise to a height in abutment with the lever 11 in the horizontal position, simultaneously lowering the right force sensor. At the same time, only one force sensor is abutted against the lever 11 in the horizontal position, and the telescopic stroke of the hydraulic cylinder is fixed each time, so that unbalance of the lever 11 is avoided.
The torque calculation formula of the torque sensor 15 is:
the torque value (delta) =f1×l2+f2×l1, the arm length of the weight set is L1, the arm lengths of the force sensors are all L2, F1 is the measured force value of the force sensor far away from the weight side, F3 is the measured force value of the force sensor near the weight side, and F2 is the weight force of the weight.
When the force sensor generates numerical value change, the lever 11 is shown to be in the horizontal position, so that the workload of early leveling can be reduced, measurement can be performed even if the leveling is not performed, whether the lever 11 is in the horizontal position can be conveniently detected, and the measurement efficiency is improved.
Referring to fig. 1 and 3, the lever 11 is rotationally connected with the machine body 1 through a rotation supporting structure, so as to realize free rotation of the lever 11, the rotation supporting structure can adopt a knife bearing structure or a low-resistance bearing 2, the knife bearing structure is more traditional, and details are not repeated here, and the embodiment only explains the low-resistance bearing 2:
the low-resistance bearing 2 comprises a bearing sleeve 21 fixed with the machine body 1 through bolts, a rotating shaft 26 connected with the lever 11 in a key way, a pressure-bearing inner ring 25 connected with the rotating shaft 26 and a supporting component 3. The bearing housing 21 is provided with a hollow cavity 24 below the upper circle of the outer contour, the bearing inner ring 25 is circular and rotatably penetrates through the hollow cavity 24, and because the hollow cavity 24 is elliptical, a gap is reserved between the top of the bearing inner ring 25 and the inner wall of the top of the hollow cavity 24, and a gap is reserved between the bottom of the bearing inner ring 25 and the inner wall of the bottom of the hollow cavity 24. Round holes are formed in the side walls of the two sides of the bearing sleeve 21, and the rotating shaft 26 penetrates through the round holes of the two sides of the bearing sleeve 21 and is circumferentially fixed with the bearing inner ring 25, so that the bearing inner ring 25 is rotationally connected with the bearing sleeve 21.
The supporting component 3 is connected with the bearing sleeve 21 and is used for applying radial and vertical upward acting force to the pressure-bearing inner ring 25 so as to reduce the pressure between the pressure-bearing inner ring 25 and the inner wall of the hollow cavity 24, thereby reducing the friction force between the pressure-bearing inner ring 25 and the hollow cavity, reducing the rotation resistance of the pressure-bearing inner ring 25, reducing the influence on the stress of the lever 11 and improving the precision of the torque standard machine. The support assembly 3 of this embodiment includes a supply source 31 and a transmission member 32, wherein the supply source 31 may be an air compressor or a high-pressure pump station, and the transmission member 32 may be a transmission tube. The bottom of the bearing housing 21 is provided with a first through hole 22 communicated with a transmission pipe, the air compressor or the high-pressure pump station is used for generating high-pressure gas or high-pressure liquid, the transmission pipe is used for injecting the high-pressure gas or the high-pressure liquid into the first through hole 22, and one side opening of the first through hole 22 is opposite to the pressure-bearing inner ring 25, so that the pressure-bearing inner ring 25 is supported by air pressure or hydraulic pressure.
In other embodiments, the first through holes 22 may have two, which are both communicated with the transmission pipe, are both located below the bearing inner ring 25, and are symmetrically distributed along a vertical line passing through the center of the bearing inner ring 25. The two first through holes 22 spray air flow toward the bearing inner ring 25, supporting the bearing inner ring 25 to reduce friction force, thereby reducing error influence of friction force between the lever 11 and the body 1 on torque measurement. And the two first through holes 22 push the bearing inner ring 25 at the same time, so that the stress on two sides of the bearing inner ring 25 is balanced, and the bearing inner ring 25 is kept centered, thereby reducing the friction between the side wall of the bearing inner ring 25 and the inner wall of the hollow cavity 24. Meanwhile, the friction force is reduced, so that the abrasion of the bearing sleeve 21 and the pressure-bearing inner ring 25 can be reduced, the service life of the low-resistance bearing 2 is prolonged, and the defect of low service life of a conventional bearing is overcome.
The weight G based on the weight has very high accuracy, and the lever arm L is kept constant, and according to the torque formula (t=gl), the torque generated by the weight can be periodically self-calibrated to the torque generated by the load cell 13, so the embodiment 1 of the present application also provides a self-calibration method, which specifically includes the following steps:
taking the calibration of the load cell 13 on the left in fig. 2 as an example:
assuming that the weight stack is composed of 10 weight sets of equal mass, 10 weights can be sequentially loaded step by step, they can generate 10 levels of torque, 0.1T, 0.2T, 0.3T, 0.4T, 0.5T, 0.6T, 0.7T, 0.8T, 0.9T, 1T, respectively.
The left force measuring piece 13 in fig. 2 is adjusted to a position where the sensing surface is abutted against the horizontal position lever 11 by the position adjusting mechanism 4, and the right position adjusting mechanism 4 is controlled to separate the right force measuring piece 13 from the lever 11;
clearing the signal of the force measuring piece 13;
the weights of the left weight stack in fig. 2 are now loaded step by step, and the torque of the load cell is calibrated by the 10-level torque produced by the left weight stack 12.
The same can be applied for self-calibration of the force-measuring cell 13 on the right.
taking the example of calibrating the torque of the torque sensor 15 in the clockwise direction in fig. 2:
s1: preparation: a torque sensor 15 is mounted with the lever 11, the torque input device.
Specifically, the input shaft of the torque sensor 15 is connected with the output shaft of the gear motor 16 through a coupling, and the output shaft of the torque sensor 15 is connected with the fixed shaft of the lever 11 through the coupling, so that the rotation axes of the three are mutually overlapped. When the accuracy level is 0.03, the coaxiality of the three components is not higher than 0.05mm. When the pressure-bearing inner ring 25 floats to the middle position of the hollow cavity 24, the rotating shaft 26 is coaxial with the torque sensor 15, the gear motor 16 and the fixed shaft.
S2: leveling: the right-hand force measuring part 13 in fig. 2 is adjusted by its position adjusting mechanism 4 to the point that the sensing surface is in contact with the lever 11 in the horizontal position, while the left-hand force measuring part 13 is separated from the lever 11, and the force measuring part 13 signal is cleared.
S3: and (3) testing: the weights of the left weight group are loaded step by step, so that the torque T1 generated by the loaded weights is close to 1/2 of the target value T of the torque value of the product to be measured, the torque input device is synchronously started, the torque output of the torque sensor 15 is increased, and the output torque of the torque input device is maintained until the torque value T2 of the force measuring piece 13 on the right reaches (T-T1).
S4: the value of the torque sensor 15 is calibrated according to the weight loaded by the weight stack and the value of the load cell 13.
And at the moment, finishing the detection of one torque measuring point of the detected product, and if the detection is needed at multiple points, adjusting the target value T of the torque value of the detected product, and repeating the steps S1-S3.
The implementation principle of the embodiment is as follows: the torque calibration of the torque sensor 15 along the clockwise direction and the anticlockwise direction can be realized through the two groups of force sensors and the two groups of weight sets, meanwhile, the high-precision weight sets can self-calibrate the force sensors, and the integral precision of the torque standard machine is improved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (6)
1. The utility model provides a self calibration couple formula moment of torsion standard machine which characterized in that: the device comprises a machine body (1), a lever (11) and a torque input device, wherein the lever (11) is rotationally connected with the machine body (1), the lever (11) is connected with a first connecting piece for coaxially connecting the lever (11) with a tested product, and the torque input device is connected with a second connecting piece for connecting the tested product with the torque input device;
the two ends of the lever (11) are detachably connected with force application pieces (12) with settable weight, and the two force application pieces (12) are symmetrically distributed along the rotation axis of the lever (11);
when in operation, only one force application piece (12) acts on the lever (11);
the rotating center of the lever (11) is located in the middle of the lever, two force measuring pieces (13) are symmetrically arranged on two sides of the lever (11), the two force measuring pieces (13) are located between the rotating center of the lever (11) and the two force applying pieces (12) respectively, the sensing surfaces of the two force measuring pieces (13) face upwards and are located below the lever (11), the horizontal height of the force measuring pieces (13) is adjustable, and the force measuring pieces (13) are used for detecting the force value of acting force of the lever (11) on the force measuring pieces (13);
the force measuring piece (13) comprises a force sensor, a position adjusting mechanism (4) is arranged on the machine body (1), the position adjusting mechanism (4) is used for adjusting the horizontal height of the force measuring piece (13), and the force applying piece (12) comprises a weight stack capable of generating different force levels;
when in operation, the sensing surface of one force measuring piece (13) is abutted with the lever (11) which rotates to the horizontal position;
the combined torque direction of the force measuring piece (13) on the left side and the force applying piece (12) on the right side to the lever (11) is opposite to the torque direction input by the torque input device, and likewise, the combined torque direction of the force measuring piece (13) on the right side and the force applying piece (12) on the left side to the lever (11) is opposite to the torque direction input by the torque input device.
2. The self-calibrating couple torque standard machine of claim 1 wherein: the sensing surface of the force measuring piece (13) is in line contact with the lever (11) so as to reduce the change of the force arm during working.
3. The self-calibrating couple torque standard machine of claim 1 wherein: the rotating center of the lever (11) is located in the middle of the lever, mounting pieces (14) are arranged at two ends of the lever (11), and the mounting pieces (14) are detachably connected with the force application piece (12).
4. The self-calibrating couple torque standard machine of claim 1 wherein: a rotary supporting structure is connected between the lever (11) and the machine body (1), and the rotary supporting structure comprises one of a knife bearing structure and a low-resistance bearing (2).
5. A self-calibrating method, implemented using the self-calibrating couple torque standard machine of any of claims 2-4, comprising the steps of:
a weight set at one end of the actuating lever (11), the weight set comprising a plurality of weights of equal mass;
the sensing surface of the force measuring piece (13) positioned on the same side with the activated weight set is abutted with the lever (11) in the horizontal position through the position adjusting mechanism (4), and the other force measuring piece (13) is separated from the lever (11);
clearing a signal of a force measuring piece (13);
the weights of the activated weight stack are loaded step by step, and the torque of the load cell (13) is calibrated by the multi-stage torque produced by the stack.
6. A method of torque testing using the self-calibrating couple torque standard machine of any of claims 2-4, comprising the steps of:
preparation: mounting a tested product, a lever (11) and a torque input device;
leveling: the sensing surface of one force measuring piece (13) is adjusted to be in butt joint with a lever (11) at the horizontal position, the other force measuring piece (13) is separated from the lever (11), and signals of the force measuring pieces (13) are cleared;
and (3) testing: starting a weight set which is positioned at the different end of the lever (11) from a force measuring piece (13) abutting against the lever (11), and gradually loading weights of the weight set to enable the torque T1 generated by the loaded weights to be close to 1/2 of a torque value target value T of a measured product; synchronously starting a torque input device, increasing the torque output of a tested product until the torque value T2 of a force measuring piece (13) reaches (T-T1), and finishing the detection of a torque measuring point of the tested product;
and (3) adjusting the torque value target value T of the measured product, and repeating the steps to finish the detection of a plurality of torque measuring points of the measured product.
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| CN117870927A (en) * | 2023-09-27 | 2024-04-12 | 苏州市计量测试院 | Lever type large torque tester for detecting loading force by using standard force sensor |
| CN117030086B (en) * | 2023-09-27 | 2024-01-23 | 苏州市计量测试院 | Lever type large torque tester and standard force sensor in-situ calibration method |
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Denomination of invention: Self calibration force couple torque standard machine, its self calibration method and torque testing method Granted publication date: 20230616 Pledgee: Daoxu Sub-branch of Zhejiang Shangyu Rural Commercial Bank Co.,Ltd. Pledgor: SHAOXING KENT MECHANICAL & ELECTRICAL Co.,Ltd. Registration number: Y2024980019652 |